A box contains 420 coins of 1 rupee, 50 paise and 20 paise coins. The ratio of their values is 13 : 11 : 7. The number of 50 paise coins is = ?

Answer: Option D

	Rs. 1	:	50 P	:	20 P
Values	13x	:	11x	:	7x
Number of coins	13x×1	:	11x×2	:	7x×5
	13x	:	22x	:	35x

Given total coins
⇒ 13x + 22x + 35x = 420
⇒ 70x = 420
⇒ x = 6
∴ Numbers of 50 paise coins are
= 22x = 22 × 6 = 132